Oppo R9 can't make calls or answer phones, but the mobile phone has Internet and can receive short messages.

If the incoming call or outgoing call of the mobile phone fails, the following methods can be adopted to eliminate it:

1. Check whether the balance of the mobile phone card is sufficient, or replace the SIM card and check whether the SIM card is abnormal;

2, mobile phone settings-about mobile phone-status information-SIM card status-signal strength, check the signal strength, change the time and place contact person, and eliminate network problems;

3. You can change the environment or turn on the flight mode and then turn it off, and try to search for the signal again;

4. Enter *#2323# (some mobile and Unicom models) in the dial-up interface, and enter Settings-Mobile Network-Turn off 3G network or switch over 2G network;

5. Make sure the phone is the latest version number. The latest version usually optimizes the stability of the system.

If the above methods fail to solve your problem, please take the purchase invoice, warranty card and mobile phone to the nearest OPPO customer service center for testing and handling.